Roller end shaft sleeve and universal coupling

Abstract

The invention discloses a roller end shaft sleeve and a universal coupling, and relates to the technical field of couplings. The shaft sleeve comprises a shaft sleeve body, a lining plate, a fastening assembly and an end cover. The lining plate is arranged on the inner side of the body and fixed through a penetrating fastening assembly. The end cover is installed on the outer side of the body and covers the end of the fastening assembly. An oil injection hole is formed in the center of the end cover and communicated with an axial oil conveying channel in the fastening assembly, a center lubricating path directly reaching the friction face of the lining plate from the outside is formed, and stress concentration caused by hole forming in the body is avoided. The end cover is matched with the fastening assembly, can abut against the nut to prevent looseness, and can also drive the bolt to rotate synchronously through rotation to drive the lining plate to move axially to compensate the fit clearance online. And a dual-sealing structure is matched, so that grease leakage and external medium erosion are effectively prevented. The problems that in the prior art, lubrication is inconvenient, connection is prone to loosening, and gaps are difficult to adjust are solved, and convenient maintenance and long-service-life operation are achieved.

Description

Technical Field

[0001] This invention relates to the field of coupling technology, and in particular to a roller end bushing and a universal coupling. Background Technology

[0002] With the development of rolling technology in the metallurgical industry, universal couplings, as core components of the main drive system of rolling mills, directly affect production efficiency and product quality. Cross-shaft universal coupling technology has emerged, characterized by high torque transmission, high transmission efficiency, and strong angular compensation capability. This has led to the development of roll end bushing devices as key connecting components. Roll end bushings are mainly used to connect the universal joint shaft to the flat end of the roll to transmit enormous rolling torque. To extend the service life of the expensive bushing body, current roll end bushings typically adopt an assembled structure, where wear-resistant liners are bolted to the inner flat hole wall of the bushing body, utilizing the contact between the liner and the roll to withstand impact and wear.

[0003] To address the problems of bolt loosening and breakage, as well as lubrication failure due to cooling water intrusion in traditional liner structures, existing technologies such as Chinese patent CN206530706U (a roller end bushing with a sealing structure) propose an improved solution. While this solution improves sealing and lubrication performance by adding a corrugated sealing ring and an oil reservoir, its core idea lies in eliminating the internal wear-resistant liner, designing the bushing body as a single integral structure, and hardening the surface of the flat hole.

[0004] While this approach fundamentally avoids the problem of loose liner bolts, it has significant drawbacks: once the surface of the bushing body in contact with the roll wears, the inexpensive liner cannot be replaced individually as in traditional structures, often leading to the scrapping of the entire expensive bushing body, greatly increasing spare parts costs and wasting resources. This solution employs radial lubrication, with the lubrication port located on the side of the bushing body. In the narrow and complex maintenance space of the rolling mill, the lubrication port is easily obstructed by external components or located at an inaccessible angle (such as the bottom). Maintenance personnel often need to frequently maneuver the massive rolling mill equipment to locate and align the lubrication port, making the operation extremely inconvenient and inefficient. Furthermore, directly drilling holes in the bushing body, which bears heavy shear forces, creates significant stress concentration points, increasing the risk of cracking under impact loads. Summary of the Invention

[0005] Therefore, it is necessary to provide a roller end bushing and a universal coupling to address the above problems.

[0006] This application provides a roller end bushing, including a bushing body, a liner, a fastening assembly, and an end cap. The liner is disposed on the inner wall of the bushing body for contacting the pressure roller. The fastening assembly passes through the bushing body and the liner to fix the liner to the bushing body. The end cap is disposed on the outer wall of the bushing body and connected to one end of the fastening assembly. The end cap has an oil injection hole at its center. The fastening assembly has an axially extending oil delivery channel inside, and the oil injection hole communicates with the oil delivery channel to deliver lubricating medium to the contact surface between the liner and the pressure roller.

[0007] Optionally, the fastening assembly includes a bolt and a nut, the fixing bolt passes through the liner and the bushing body, and the oil delivery channel is located on the central axis of the bolt.

[0008] Optionally, the end cap has a mounting groove on the side facing the connecting assembly, and an oil passage sealing ring is provided in the mounting groove. The oil passage sealing ring is sandwiched between the bottom surface of the end cap and the end face of the bolt or nut, and is arranged around the joint of the oil injection hole and the oil delivery channel to prevent leakage of the lubricating medium during transportation.

[0009] Optionally, a sealing groove is provided on the side wall of the end cap, and an end cap sealing ring is provided in the sealing groove. The end cap sealing ring is sandwiched between the side wall of the end cap and the mating surface of the bushing body, so that the installation space where the fastening assembly is located forms a sealed cavity isolated from the external environment.

[0010] Optionally, the bushing body is further provided with a slot and an outer retaining ring. The outer retaining ring is disposed in the slot and abuts against the end cover to restrict the movement of the end cover and / or fastening components away from the bushing body.

[0011] Optionally, the liner is provided with mounting holes for the bolts to pass through. The mounting holes are flat holes with a pair of parallel abutment surfaces. The distance between the pair of abutment surfaces is adapted to the width of the opposite sides of the hexagonal head of the bolt or the nut, so as to restrict the bolt or nut from rotating in the mounting holes.

[0012] Optionally, the outer surface of the end cap has an external hexagonal structure, which is used for external tools to clamp and apply rotational torque.

[0013] Optionally, the bolt passes through the bushing body and the liner plate, the hexagonal head of the bolt is set in the mounting hole, and the other end extends out of the bushing body for the nut to be tightened. The bottom surface of the end cap is provided with an inner hole, and the inner hole is provided with a thread adapted to the bolt. The end cap is screwed into the bolt through the thread until it abuts against the nut to prevent the nut from loosening.

[0014] Optionally, the bolt passes through the bushing body and the liner, the nut is disposed in the mounting hole, and the bottom surface of the end cap has an inner hole that is adapted to the hexagonal head of the bolt. By rotating the end cap, the bolt is driven to rotate, thereby driving the liner closer to the bushing body to compensate for the fit clearance between the liner and the bushing body.

[0015] This application also provides a universal coupling, including the aforementioned roller end bushing.

[0016] Compared with the prior art, the technical solution provided in this application has the following advantages: The aforementioned roller end bushing optimizes the lubrication path while maintaining structural strength by integrating the oil injection channel inside the fastening assembly and connecting it to the center hole of the end cap. Specifically, existing technologies typically require drilling deep radial holes in the bushing body, which bears heavy torque loads, to establish oil passages. This inevitably creates stress concentration areas on the bushing body, making it highly susceptible to fatigue cracks and fracture under the high-load alternating stress of the rolling mill. This embodiment, however, employs a centrally connected lubrication path design between the end cap and the fastening assembly, cleverly avoiding destructive openings to the bushing body. The fastening assembly (such as bolts) is located within the mounting hole of the bushing body, where the shear and bending stress distribution along its central axis is extremely low. Establishing an axially connected oil channel at this location does not weaken its fastening strength, thus maximizing the preservation of the bushing body's structural integrity and load-bearing capacity while ensuring connection reliability.

[0017] Meanwhile, the end cap, serving as an external interface, connects to the internal fastening components and links to the oil passage, forming a targeted lubrication channel that runs directly from the outside to the friction surface of the liner. The lubricating medium can be directly delivered to the contact area between the most severely worn liner and the pressure roller without complex detours, which not only reduces oil injection resistance but also ensures the accuracy and effectiveness of lubrication, effectively solving the problem that traditional lateral oil injection cannot reach the core load-bearing area. Attached Figure Description

[0018] Figure 1 A schematic diagram of the axial cross-sectional structure of a roller end bushing provided in an embodiment of this application; Figure 2 A longitudinal cross-sectional view of a roller end bushing provided in an embodiment of this application; Figure 3 for Figure 1 A partially enlarged cross-sectional view of the mating point between the end cap and the fastening assembly; Figure 4 An exploded view of the end cap assembly and fastening assembly provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a liner provided in one embodiment of this application; Figure 6 This is a side view of the end cap structure provided in an embodiment of this application. Explanation of reference numerals in the attached figures: 1. Bushing body; 11. Slot; 2. Liner; 21. Mounting hole; 3. Fastening assembly; 31. Oil supply channel; 32. Bolt; 33. Nut; 4. End cover; 41. Oil injection hole; 42. Mounting groove; 43. Sealing groove; 44. Inner hole; 45. Cover; 5. Oil passage sealing ring; 6. End cover sealing ring; 7. Outer retaining ring. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] Example 1 See Figures 1 to 3 An embodiment of the present invention provides a roller end bushing, including a bushing body 1, a liner 2, a fastening assembly 3, and an end cap 4. The liner 2 is disposed on the inner wall of the bushing body 1 for contacting the pressure roller. The fastening assembly 3 passes through the bushing body 1 and the liner 2 to fix the liner 2 to the bushing body 1. The end cap 4 is disposed on the outer wall of the bushing body 1 and connected to one end of the fastening assembly 3. The end cap 4 has an oil injection hole 41 at its center. The fastening assembly 3 has an axially penetrating oil delivery channel 31 inside. The oil injection hole 41 communicates with the oil delivery channel 31 to deliver lubricating medium to the contact surface between the liner 2 and the pressure roller.

[0021] The roller end bushing provided in this embodiment achieves significant structural optimization and enhanced lubrication by integrating the oil injection channel into the fastening assembly 3 and connecting it to the center hole of the end cap 4.

[0022] Specifically, existing technologies typically require drilling deep radial holes in the bushing body 1, which bears heavy torque loads, to establish oil passages. This inevitably creates stress concentration areas on the bushing body 1, making it highly susceptible to fatigue cracks and fracture under the high-load alternating stress of the rolling mill. This embodiment, however, employs a centrally connected lubrication path design of "end cap 4 - fastening assembly 3," cleverly avoiding destructive openings in the bushing body 1. The fastening assembly 3 (such as bolt 32) is located within the mounting hole 21 of the bushing body 1, where shear and bending stress distribution is extremely low. Establishing an axially connected oil passage 31 at this location does not weaken its fastening strength, thus maximizing the preservation of the structural integrity and load-bearing capacity of the bushing body 1 while ensuring connection reliability.

[0023] Meanwhile, the end cap 4 serves as an external interface, connecting to the internal fastening assembly 3 and linking to the oil passage, forming a targeted lubrication channel that extends directly from the outside to the friction surface of the liner 2. The lubricating medium can be directly delivered to the contact area between the most severely worn liner 2 and the pressure roller without undergoing complex detours. This not only reduces the oil injection resistance but also ensures the accuracy and effectiveness of lubrication, effectively solving the problem that traditional lateral oil injection cannot reach the core load-bearing area.

[0024] See Figures 1 to 4 The roller end bushing provided in this embodiment includes a fastening assembly 3 comprising a bolt 32 and a nut 33. The fixing bolt 32 passes through the liner 2 and the bushing body 1, and the oil delivery channel 31 is opened on the central axis of the bolt 32. By integrating the oil delivery channel 31 at the center of the bolt 32, not only is the basic function of the bolt 32 as a fastener utilized, but it also functions as an "oil pipe," achieving the reuse of part functions and simplifying the system structure. At the same time, the axially continuous straight oil passage has low resistance, which is conducive to the rapid delivery of lubricating grease.

[0025] From a materials mechanics perspective, the bushing body 1 is subjected to enormous alternating torque and shear loads during the rolling process, and any radial opening on the body can become a source of fatigue crack initiation. This embodiment achieves lubrication by "borrowing" the central space of bolt 32 without weakening the cross-section of the bushing body 1. Furthermore, the shear stress and bending stress at the central axis of bolt 32 are extremely small, and the opening has negligible impact on its fastening performance. Simultaneously, this arrangement utilizes the centrifugal force effect during the high-speed rotation of the roller-end bushing. The lubricating medium located at the center of rotation tends to diffuse radially outward to the friction surface of the liner 2 under the action of centrifugal force, achieving a more efficient and uniform dynamic self-lubricating effect compared to the traditional static oiling method.

[0026] See Figures 3 to 4 The roller end bushing provided in this embodiment has an installation groove 42 on the end face of the end cover 4 facing the connecting component. An oil passage sealing ring 5 is provided in the installation groove 42. The oil passage sealing ring 5 is sandwiched between the bottom surface of the end cover 4 and the end face of the bolt 32 or nut 33, and is arranged around the joint of the oil injection hole 41 and the oil delivery channel 31 to prevent leakage of the lubricating medium during the delivery process.

[0027] This technical feature effectively solves the sealing problem of the lubrication circuit. Under the action of oil injection pressure, the oil circuit sealing ring 5 is tightly compressed, ensuring that the grease will not overflow from the mating surface of the end cover 4 and the bolt 32 into the cavity of the end cover 4. This ensures that all the oil injection pressure is used to deliver the grease to the friction interface, avoiding insufficient lubrication and grease waste caused by leakage.

[0028] See Figure 3 , Figure 4 and Figure 6 The roller end bushing provided in this embodiment has a sealing groove 43 on the side wall of the end cover 4, and a sealing ring of the end cover 4 is provided in the sealing groove 43. The sealing ring of the end cover 4 is sandwiched between the side wall of the end cover 4 and the mating surface of the bushing body 1, so that the installation space where the fastening component 3 is located forms a sealed cavity isolated from the external environment.

[0029] This structure achieves reliable protection through the sealing ring of the end cap 4, completely encasing the fastening component 3 (threaded connection) in a "dry" environment. This completely blocks the intrusion of external cooling water, dust, and corrosive media, preventing the bolts 32 and nuts 33 from corroding. This ensures the reliability of the connection and also ensures that the threads remain intact during subsequent maintenance and disassembly, avoiding the need for destructive cutting due to rust and enabling the reuse of components.

[0030] In response to the harsh working conditions of high temperature and humidity and dense iron oxide dust at the steel rolling mill, the "internal-external" dual-sealing defense system constructed in this embodiment plays a crucial protective role. The sealing ring of end cap 4, located on the side wall of end cap 4, constitutes the external protective line. Relying on the axial pressure generated by tightening end cap 4, the sealing ring undergoes elastic deformation and fills the mating gap, completely encasing the internal fastening component 3 in an airtight cavity isolated from the outside world. This completely blocks the infiltration path of cooling water and corrosive gases, ensuring that the threaded pair remains rust-free even after long-term operation and guaranteeing the ease of disassembly for subsequent maintenance. The oil passage sealing ring 5, located at the oil filling joint, constitutes the internal pressure defense line. Utilizing the principle of pressure self-sealing, under the high pressure of the oil gun, the sealing lip tightly adheres to the sealing surface, forcibly guiding the grease to flow unidirectionally directly to the friction working surface. This effectively prevents grease from overflowing back into the inner cavity of end cap 4, avoiding grease waste and preventing disassembly difficulties caused by the inner cavity of end cap 4 being filled with high-pressure grease.

[0031] See Figure 3 and Figure 4 The roller end bushing provided in this embodiment also has a groove 11 and an outer retaining ring 7 on the bushing body 1. The outer retaining ring 7 is disposed in the groove 11 and abuts against the end cover 4 to restrict the movement of the end cover 4 and / or the fastening assembly 3 away from the bushing body 1. The outer retaining ring 7 provides a "double insurance" effect. Even if the threaded connection of the end cover 4 loosens under extreme vibration conditions, the outer retaining ring 7 can still physically prevent the end cover 4 from falling out, preventing parts from falling and causing greater equipment accidents, and significantly improving the operational safety of the system.

[0032] See Figure 5The roller end bushing provided in this embodiment has a mounting hole 21 on the liner plate 2 for the bolt 32 to pass through. The mounting hole 21 is a flat hole structure with a pair of parallel abutment surfaces. The distance between the pair of abutment surfaces is adapted to the width of the opposite sides of the hexagonal head of the bolt 32 or the nut 33 to restrict the bolt 32 or the nut 33 from rotating in the mounting hole 21.

[0033] The flat hole structure achieves the anti-rotation function through the form-locking principle. During the tightening or adjustment process, the internal fasteners (bolt 32 or nut 33) are locked by the flat hole and cannot rotate with it, thus ensuring that the external rotational torque can be effectively converted into axial tightening force or adjustment force. This is the key structure that enables tightening to be completed by unilateral operation.

[0034] See Figure 6 The roller end bushing provided in this embodiment has an external hexagonal structure on the outside of the end cover 4, which is used for external tools to clamp and apply rotational torque. This design allows maintenance personnel to operate the end cover 4 using standard wrenches or socket tools without the need for special tools, which greatly facilitates on-site installation, disassembly, and subsequent clearance adjustment work, and improves maintenance efficiency. In addition, the oil injection hole 41 of the end cover 4 is provided with a cap 45, which is replaced after lubrication.

[0035] See Figure 2 In this embodiment, the roller end bushing has a bolt 32 that passes through the liner 2 and the bushing body 1. The hexagonal head of the bolt 32 is set in the mounting hole 21, and the other end extends out of the bushing body 1 for the nut 33 to be tightened. The bottom surface of the end cover 4 is provided with an inner hole 44, and the inner hole 44 is provided with a thread that is compatible with the bolt 32. The end cover 4 is screwed into the bolt 32 through the thread until it is pressed against the nut 33 to prevent the nut 33 from loosening.

[0036] This embodiment demonstrates the "anti-loosening" function of the end cap 4. In this structure, the end cap 4 effectively acts as a locking nut 33 (or a reverse nut 33). When the end cap 4 is tightened and abuts against the end face of the nut 33, it applies additional axial pressure to the nut 33, increasing the friction of the threaded pair, thereby effectively preventing the nut 33 from retracting under alternating loads. This mechanical anti-loosening structure replaces the traditional welding fixing method, ensuring both the tightness of the connection and retaining the possibility of disassembly.

[0037] Example 2 One embodiment of the present invention provides a roller end bushing, the basic structure of which is similar to that of embodiment 1, the difference being the installation direction of the fastening component 3 and the mating relationship between the end cover 4 and the fastening component 3.

[0038] In this embodiment, the roller end bushing has a bolt 32 that passes through the bushing body 1 and the liner 2, and a nut 33 that is set in the mounting hole 21. The bottom surface of the end cover 4 has an inner hole 44 that is adapted to the hexagonal head of the bolt 32. By rotating the end cover 4, the bolt 32 is driven to rotate, thereby driving the liner 2 to approach the bushing body 1 to compensate for the fit clearance between the liner 2 and the bushing body 1.

[0039] This embodiment focuses on demonstrating the "clearance compensation" function of the end cap 4. Through the shape matching of the end cap 4 and the bolt head 32 (e.g., an internal hexagonal hole matching an external hexagonal head), the end cap 4 becomes an operating handle. When wear of the liner 2 causes increased clearance, maintenance personnel do not need to disassemble the bushing; they only need to rotate the end cap 4 externally to rotate the bolt 32. Since the internal nut 33 is restricted from rotation by the flat hole, the rotation of the bolt 32 is converted into axial tension, pulling the liner 2 outwards and thus eliminating the clearance. This "online adjustment" mechanism changes the maintenance method from passive replacement to active compensation, significantly extending the service life of the liner 2 and reducing maintenance costs.

[0040] Specifically, due to the defined thread helix angle between the bolt 32 and the mating nut 33 (or the threaded hole of the liner 2), when the operator applies a rotational torque through the external hexagonal end cap 4, the end cap 4 forces the bolt 32 to rotate synchronously through the form-locking structure of its inner cavity. Constrained by the anti-rotation effect of the flat hole of the liner 2 on the nut 33, the rotational motion of the bolt 32 is forcibly converted into an axial linear feed motion. This design ensures that every minute angular rotation of the end cap 4 precisely corresponds to a minute component of the axial displacement of the liner 2, thereby accurately eliminating minute fit clearances caused by wear and avoiding the problems of over-tightening or over-loosening caused by uncontrollable installation preload in traditional disassembly and adjustment methods. Furthermore, this "tensioning" adjustment keeps the bolt 32 under tension at all times, eliminating the backlash between the threaded pairs and further improving the structural rigidity of the roller end bushing under frequent forward and reverse rotation conditions.

[0041] Example 3 One embodiment of the present invention provides a universal coupling, including the roller end bushing described in Embodiment 1 or Embodiment 2 above.

[0042] Thanks to the use of the roller end bushings with self-lubricating, sealing and corrosion-resistant, anti-loosening and adjustable clearance functions, the overall operational stability of the universal coupling under harsh working conditions is significantly improved, the failure rate is reduced, and the maintenance cycle is extended, thereby ensuring the continuous and efficient operation of the main drive system of the rolling mill.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A roller end bushing, characterized in that, The assembly includes a bushing body (1), a liner (2), a fastening assembly (3), and an end cap (4). The liner (2) is disposed on the inner wall of the bushing body (1) and is used to contact the pressure roller. The fastening assembly (3) passes through the bushing body (1) and the liner (2) to fix the liner (2) on the bushing body (1). The end cap (4) is disposed on the outer wall of the bushing body (1) and is connected to one end of the fastening assembly (3). The end cap (4) has an oil injection hole (41) at its center. The fastening assembly (3) has an axially penetrating oil supply channel (31) inside. The oil injection hole (41) communicates with the oil supply channel (31) to deliver lubricating medium to the contact surface between the liner (2) and the pressure roller.

2. The roller end bushing according to claim 1, characterized in that, The fastening assembly (3) includes a bolt (32) and a nut (33). The fixing bolt (32) passes through the liner (2) and the bushing body (1). The oil delivery channel (31) is opened on the central axis of the bolt (32).

3. The roller end bushing according to claim 2, characterized in that, The end cap (4) has a mounting groove (42) on the end face facing the connecting assembly. An oil passage sealing ring (5) is provided in the mounting groove (42). The oil passage sealing ring (5) is sandwiched between the bottom surface of the end cap (4) and the end face of the bolt (32) or nut (33), and is arranged around the joint of the oil injection hole (41) and the oil delivery channel (31) to prevent leakage of lubricating medium during transportation.

4. The roller end bushing according to claim 3, characterized in that, The end cap (4) has a sealing groove (43) on its side wall surface. The sealing groove (43) is provided with an end cap (4) sealing ring. The end cap (4) sealing ring is sandwiched between the side wall surface of the end cap (4) and the mating surface of the bushing body (1) so that the installation space where the fastening component (3) is located forms a sealed cavity isolated from the external environment.

5. The roller end bushing according to claim 4, characterized in that, The bushing body (1) is also provided with a slot (11) and an outer retaining ring (7). The outer retaining ring (7) is disposed in the slot (11) and abuts against the end cover (4) to restrict the end cover (4) and / or the fastening assembly (3) from moving away from the bushing body (1).

6. The roller end bushing according to claim 5, characterized in that, The liner (2) has a mounting hole (21) for the bolt (32) to pass through. The mounting hole (21) is a flat hole structure with a pair of parallel abutment surfaces. The distance between the pair of abutment surfaces is adapted to the width of opposite sides of the hexagonal head of the bolt (32) or the nut (33) to restrict the bolt (32) or nut (33) from rotating in the mounting hole (21).

7. The roller end bushing according to claim 6, characterized in that, The end cap (4) has an external hexagonal structure on the outside, which is used for external tools to clamp and apply rotational torque.

8. The roller end bushing according to any one of claims 2-7, characterized in that, The bolt (32) passes through the bushing (2) and the bushing body (1). The hexagonal head of the bolt (32) is set in the mounting hole (21), and the other end extends out of the bushing body (1) for the nut (33) to tighten. The bottom surface of the end cap (4) is provided with an inner hole (44). The inner hole (44) is provided with a thread that matches the bolt (32). The end cap (4) is screwed into the bolt (32) through the thread until it abuts against the nut (33) to prevent the nut (33) from loosening.

9. The roller end bushing according to any one of claims 2-7, characterized in that, The bolt (32) passes through the bushing body (1) and the liner (2). The nut (33) is set in the mounting hole (21). The bottom surface of the end cover (4) is provided with an inner hole (44). The inner hole (44) is adapted to the hexagonal head of the bolt (32). By rotating the end cover (4), the bolt (32) is driven to rotate, so as to drive the liner (2) to approach the bushing body (1) to compensate for the fit clearance between the liner (2) and the bushing body (1).

10. A universal coupling, characterized in that, Includes the roller end bushing as described in any one of claims 1-9.

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